It depends on what you want to use it for. Common quartz sand, used for concrete aggregate and other aspects of building and road construction, is one of the cheapest mineral commodities around (although it adds up to a lot – industrial sand & gravel in the US was worth $7.6 billion in 2008, more than all the gold produced in the US). High-purity glass sand is more expensive. And if you mean quartz crystals for electronics, they can get up to $199 per kilogram, close to $100 per pound – but most such quartz crystals are made in labs rather than mined, and the US imports most of them from China.
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